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Doubles & Triples Practice Question 6

TDoubles & Triples · Question 6

Coupling a converter dolly to a second trailer involves:

• AJust hooking up the air lines
• BBacking the dolly under the trailer (or pushing the dolly to the trailer), engaging the kingpin into the dolly's fifth wheel, securing safety chains, and connecting air and electrical
• CDriving the dolly under power
• DWelding the dolly in place

Correct answer: B. Backing the dolly under the trailer (or pushing the dolly to the trailer), engaging the kingpin into the dolly's fifth wheel, securing safety chains, and connecting air and electrical

Why: Dollies must be properly aligned, the kingpin secured in the fifth wheel, safety chains connected, and air/electrical lines run before any movement.

How this question fits the Doubles/Triples test

Each additional articulation point multiplies rearward amplification. A driver pulling triples must steer earlier, brake sooner, and inspect twice as much equipment as a single-trailer driver.

Study technique for this topic

Learn the correct trailer placement order by weight, the procedure for converting a single to a double, and the special inspection items unique to converter dollies and pintle hook assemblies.

Related Doubles/Triples practice questions

• Q18. When backing doubles, drivers typically:
• Q31. When parked overnight, you should:
• Q44. A driver should never attempt to:
• Q57. When the company changes how trailers must be ordered, the driver should:
• Q11. Doubles and triples are most likely to roll over:

Continue your CDL preparation

The Doubles & Triples portion of the CDL knowledge exam covers more than this single question. Use this site's full Doubles & Triples bank to drill every topic, then test yourself with one of our state-specific practice sets to confirm you are ready for the actual DMV exam in your state. Always check your state's CDL handbook for any local addenda before the test day.

If you are still building your overall CDL foundation, start with the General Knowledge bank — every CDL applicant must pass it — and then work outward to the endorsements you plan to add.